A noise determination device is provided that determines the presence of noise on an input signal with a constant value that is output from an external device. The noise determination device includes a sampling unit that performs three samplings on the input signal, a sampling-interval setting unit that sets an interval between a first one and a second one of the samplings to have a value that is different from an integral multiple of the period of the periodic noise, and sets an interval between the second one and a third one of the samplings to be equal to or larger than an interval that is large enough to fully attenuate the periodic noise, and a noise determination unit that determines that the noise is not superimposed on the input signal only when all values acquired by the first, second, and third samplings match one another.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A noise determination device that determines, in an environment where periodic noise is generated, presence of noise on an input signal having a constant value that is output from an external device, the noise determination device comprising: a sampling unit that performs three samplings on the input signal; a sampling-interval setting unit that sets an interval between a first one and a second one of the samplings to have a value that is different from an integral multiple of a period of the periodic noise, and sets an interval between the second one and a third one of the samplings to be equal to or larger than an interval that is large enough to fully attenuate the periodic noise; and a noise determination unit that determines that the noise is not superimposed on the input signal only when all values acquired by the first, second, and third samplings match one another.
2. A noise determination device that determines, in an environment where periodic noise is generated, presence of noise on an input signal with a constant value that is output from an external device, the noise determination device comprising: a sampling unit that performs three samplings on the input signal; a sampling-interval setting unit that sets an interval between a first one and a second one of the samplings have a first value that is different from an integral multiple of a period of the periodic noise, and sets an interval between the first one and a third one of the samplings to have a second value that is different from an integral multiple of the period and is larger than the first value, the second value being equal to or larger than an interval that is large enough to fully attenuate the periodic noise; and a noise determination unit that determines that the noise is not superimposed on the input signal only when all values acquired by the first, second, and third samplings match one another.
3. The noise determination device according to claim 1 , wherein the sampling-interval setting unit sets the interval between the first and second samplings to have a value that is obtained by adding a value of one quarter of the period or three quarters of the period to an integral multiple of the period.
4. The noise determination device according to claim 2 , wherein phases of the first value and the second value are different with respect to the period.
5. The noise determination device according to claim 2 , wherein the sampling-interval setting unit sets the interval between the first and second samplings to have a value that is obtained by adding a value of one quarter or three quarters of the period to an integral multiple of the period.
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April 4, 2013
July 19, 2016
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